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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d91aa947ae5bf1c1a9370dcb59c23c051fc7cc3eff528dc13ca37a63308894b' 
  AND token = 'ADyIcG5M7HFVmJ+PyMcqFb2YhYhIinaoCp9UFGgcsSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}